The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 1978
Filed:
Dec. 12, 1973
Takanori Shibata, Hitachi, JA;
Katsuji Marumoto, Hitachi, JA;
Keishin Matsumoto, Tokyo, JA;
Abstract
A direct current motor control device for use in battery automobiles comprises a direct current motor to be driven by a plurality of battery groups each battery group delivering an equal voltage. The device comprises a battery change-over thyristor circuit inclusive of a chopper circuit and can control the voltage applied to the motor by means of the chopping operation of the chopping circuit and the series-parallel change-over operation for the battery groups. The series-parallel change-over operation of the battery groups is automatically effected in response to the signal for controlling the control signal of time ratio for the chopper circuit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile